Fajardo Portillo, Jose Oscar

Personal information

Fajardo Portillo, Jose Oscar

Address: Alda. de Urquijo s/n. C.P.: 48013. Bilbao
Email: joseoscar.fajardo@ehu.es
Telephone: +34 94 601 7361


Academic degrees

University Degree

Career: Engineering in Telecommunications
Intensificación: Telematics
Center: University of The Basque Country
Date of achievement: 2003


Program title: Tecnologías de la Información y Comunicaciones en Redes Móviles
DEA date of achievement: 2005
Thesis title: Adaptación de los mecanismos de provisión de calidad de servicio a las preferencias de los usuarios (Adaptation of QoS provisioning mechanisms to user requirements)
Date of achievement: (In progress)


Dealing with Energy–QoE tradeoffs in mobile video

Fidel Liberal, Ianire Taboada, Jose Oscar Fajardo
Journal of Computer Networks and Communications

Scalable video coding allows an efficient provision of video services at different quality levels with different energy demands. In order to deal with the resulting trade-off we analyze the number of video layers that are worth to be received taking into account the energy constraints. On one hand, a single-objective optimization is proposed based on dynamically selecting the number of layers, which is able to minimize the energy consumption with the constraint of a minimal quality threshold to be reached. However, this approach cannot reflect the fact that the same increment of energy consumption may result on different increments of visual quality. Thus, a multi-objective optimization is proposed and a utility function defined in order to weight the energy consumption and the visual quality criteria. Finally, since the optimization solving mechanism is computationally expensive to be implemented in mobile devices, a heuristic algorithm is proposed. This way mobile operators and end users could significally reduce their energy consumption while keeping reasonable quality levels.

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Conference Papers